Numeric Calculation Of High Velocity Impact Problems With Smoothed Particle Hyrodynamics Method

Whether in ancient or modern, impact plays a very important role in the process ofhuman life. At present, various traffic tools and space exploration instruments bring greatconvenience to the mankind’s production and life. With the life rhythm acceleratingceaselessly, tools or instruments are all developing towards high speed. When the high speedbrings us enjoyment, it is also accompanied by many hidden high-speed impact dangers, suchas traffic accidents, bird striking aircraft accidents, space debris impacting instrumentaccidents. Revealing the essence of high speed impact problems can help us find the evidenceto remove these dangers. Therefore research on the high speed impact is valuable in academicand application. High speed impact problems are always with large deformation, whichcauses a lot of challenges to traditional grid methods on researching these problems.Smoothed particle dynamics method (SPH) is chosen in this paper to study high speed impactproblems.SPH solver of the ANSYS/AUTODYN simulation software is chosen to study threeimpact questions, i.e. aluminum ball impact aluminum plate, Taylor Bar impact problem andsteel ball impact aluminum plate. Research on the crevasse size break aluminum ball impactplate in the process of size shows that, with the increase of impact velocity, break diameterwill increase, the impact velocity range break size almost changes linearly with speedincreases, but when the speed is greater than a certain value, the broken mouth size does notincrease any more. The break size and contents based on the empirical formula, the previouslyproposed break size correction. The steel ball impact plate problem analysis, relationshipbetween aluminum plastic deformation and failure effect and ball velocity, diameter, and thethickness of plate is discussed in detail. In the course of the study, also found a lot of problems with the SPH solver.According to the problem the SPH solver, it make a SPH program based on the SPHtheory and added particle adaptive algorithm to calculate the high speed impact problems inthis paper. The calculation of Taylor Bar under the same conditions the results and previousexperimental results comparison, verification the improved method of SPH is feasible. Thecalculation process of aluminum ball impact aluminum embodies the advantages of adaptiveparticle division method.The material point method (MPM) has a lot of crossover in the applications with theSPH method, so we should compare the stress wave propagation in one-dimensional elasticrod. Research shows that, by increasing the number of background grid can improve thecalculation precision of MPM method. And on the issue of SPH has a higher accuracy thanMPM.